Injection device for powdered drugs and injection method for powdered drugs

Abstract

A device ( 1 ) for spraying powdery chemical agent includes a tubular guide member ( 21 ) to be installed in a container body ( 11 ), a gas generating agent ( 43 ) to be housed in a tubular part ( 26 ), a tubular rupturing member ( 31 ) for breaking a sealing part ( 41 ) to allow the gas generating agent ( 43 ) to fall in liquid within the container body ( 11 ), a piston ( 63 ) sliding airtightly against a lower side sliding inner peripheral wall ( 53 ) and defining an air space relative to an upper side diameter-enlarged inner peripheral wall ( 55 ), and a powdery chemical agent ( 3 ) to be stored on the piston ( 63 ).

1 . A device for spraying powdery chemical agent, the device comprising:
 a container body for storing liquid therein, the container body having an upper end opening;   a tubular guide member comprising:
 a lid part covering the upper end opening; 
 a tubular part formed in the lid part so as to penetrate into the lid part, both ends of the tubular part facing an interior and an exterior of the container body; and 
 a sealing part extending inward the container body and sealing a lower end opening of the tubular part, the tubular guide member being installed in the upper end opening; 
   a gas generating agent that reacts with the liquid stored in the container body to generate reactive gas, the gas generating agent being contained in the tubular part;   a tubular rupturing member held by the tubular guide member in a movable state toward the sealing part, wherein a pressing part is provided on a lower end part of the tubular rupturing member and breaks the sealing part to allow the gas generating agent to fall in the liquid stored in the container body;   a piston sliding airtightly against a lower side sliding inner peripheral wall of a cylinder part provided in an upper end part of the tubular rupturing member, and defining an air space relative to an upper side diameter-enlarged inner peripheral wall of the cylinder part; and   a powdery chemical agent that is a chemical agent itself or a chemical agent impregnated in or mixed with a powder, the powdery chemical agent being stored on the piston.   
     
     
         2 . The device for spraying powdery chemical agent according to  claim 1 , wherein the piston comprises a tubular piston body having a closed-bottom and a vapor tap hole bored in a vicinity of a bottom of a peripheral wall of the piston body; and
 wherein a sealing part is provided in an upper end part of the upper side diameter-enlarged inner peripheral wall and slides airtightly against a peripheral wall of the piston body.   
     
     
         3 . The device for spraying powdery chemical agent according to  claim 2 , wherein a cap provided with a spray nozzle is provided on an upper open end of the piston body. 
     
     
         4 . The device for spraying powdery chemical agent according to  claim 1 , wherein a lock mechanism obstructing a movement of the tubular rupturing member toward the sealing part is provided between the tubular guide member and the tubular rupturing member. 
     
     
         5 . A device for spraying powdery chemical agent, the device comprising:
 a container body for storing liquid therein, the container body having an upper end opening;   a bag body which is covered on an upper opening of the container body and stores a gas generating agent therein, the gas generating agent reacting with the liquid stored in the container body to generate reactive gas;   a tubular guide member installed in an upper part of the container body;   a tubular rupturing member which is held by the tubular guide member in a movable state toward the bag body, and comprises a tip blade for rupturing the bag body to allow the gas generating agent to fall in the liquid stored in the container body;   a cylinder part disposed inward the tubular rupturing member, wherein both open ends of the cylinder part are able to communicate an interior and an exterior of the container body with each other;   a piston sliding airtightly against a lower side sliding inner peripheral wall of the cylinder part and having an air space relative to an upper side diameter-enlarged inner peripheral wall of the cylinder part; and   a powdery chemical agent that is a chemical agent itself or a chemical agent impregnated in or mixed with a powder, the powdery chemical agent being stored in the piston.   
     
     
         6 . The device for spraying powdery chemical agent according to  claim 5 , wherein a lock mechanism obstructing a movement of the tubular rupturing member toward the bag body is provided between the tubular guide member and the tubular rupturing member. 
     
     
         7 . The device for spraying powdery chemical agent according to  claim 5 , wherein a cap provided with a spray nozzle is provided on an upper side open end side of the cylinder part. 
     
     
         8 . The device for spraying powdery chemical agent according to  claim 5 , wherein the tip blade formed into annular shape so as to be opposed to an upper surface of the bag body on the outside of a radial direction from a lower side open end of the cylinder part breaks the bag body such that the bag body is annularly bored. 
     
     
         9 . A device for spraying powdery chemical agent, the device comprising:
 a container body having an upper end opening;   a cylinder installed in a lid body covering the upper end opening, both ends of the cylinder face an interior and an exterior of the container body;   a powdery chemical agent that is a chemical agent itself or a chemical agent impregnated in or mixed with a powder, the powdery chemical agent being contained in the cylinder; and   a piston sliding airtightly against a lower side sliding inner peripheral wall of the cylinder, and having an air space relative to an upper side diameter-enlarged inner peripheral wall of the cylinder,   wherein reactive gas is generated in the container body to push the piston up along the lower side sliding inner peripheral wall.   
     
     
         10 . The device for spraying powdery chemical agent according to  claim 9 , wherein a spray nozzle is provided on an upper side open end of the cylinder. 
     
     
         11 . The device for spraying powdery chemical agent according to  claim 10 , wherein the piston which has reached the upper side diameter-enlarged inner peripheral wall of the cylinder is obstructed from the movement toward the spray nozzle. 
     
     
         12 . A device for spraying powdery chemical agent, the device comprising:
 a container body for storing liquid therein;   a first cap installed in the first opening and comprising:
 a lid part covering a first opening of the container body; and 
 a cylinder part formed in the lid part so as to penetrate into the lid part, both ends the cylinder part facing an interior and an exterior of the container body; 
   a piston sliding airtightly against a sliding inner peripheral wall of the cylinder part, and having an air space relative to a diameter-enlarged inner peripheral wall of the cylinder part;   a powdery chemical agent that is a chemical agent itself or a chemical agent impregnated in or mixed with a powder, the powdery chemical agent being contained in a housing chamber defined by the diameter-enlarged inner peripheral wall;   a second cap installed in a second opening of the container body and comprising:
 a lid part covering the second opening of the container body; 
 a tubular part formed in the lid part so as to penetrate into the lid part, both ends of the tubular part facing an interior and an exterior of the container body; and 
 a sealing part extending inward the container body and sealing an interior side opening of the tubular part; 
   a gas generating agent that reacts with the liquid stored in the container body to generate reactive gas, the gas generating agent being contained in the tubular part; and   a rupturing member which is held by the second cap in a movable state toward the sealing part, wherein a pressing part is provided on a tip part of the rupturing member and breaks the sealing part to incorporate the gas generating agent into the liquid stored in the container body.   
     
     
         13 . The device for spraying powdery chemical agent according to  claim 12 , wherein an elasticity energizing member provided on the first cap applies a prescribed resistance force to the piston moving from the sliding inner peripheral wall to the diameter-enlarged inner peripheral wall. 
     
     
         14 . A method for spraying powdery chemical agent, the method comprising:
 a step of generating reactive gas within a container body having an opening;   a step of installing a lid body, which is installed with a cylinder, in the opening such that an inward side open end of the cylinder faces an interior of the container body and an outward side open end of the cylinder faces an exterior of the container body, wherein the cylinder contains a piston, a powdery chemical agent that is a chemical agent itself or a chemical agent impregnated in or mixed with a powder is stored in the piston, and the piston slides airtightly against a sliding inner peripheral wall and has an air space relative to a diameter-enlarged inner peripheral wall; and   a step of moving the piston from the sliding inner peripheral wall to the diameter-enlarged inner wall by a pressure the reactive gas which has reached a prescribed pressure value or more within the container body, thereby spraying and diffusing the powdery chemical agent stored in the cylinder.